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U.S. stocks started October slightly higher on Thursday, October 1, 2026: the S&P 500 rose 0.2%, while the Dow and Nasdaq each gained less than 0.1%. Micron climbed after reporting record fiscal-year results, and Mattel surged amid press reports of takeover interest—but Mattel’s announcement confirmed a leadership change, not a bid or deal terms.
How did the stock market do on October 1?
The broad market’s advance was modest. The Associated Press reported these closing levels for Thursday’s session:
| Index | October 1 close | Change that session |
|---|---|---|
| S&P 500 | 7,666.45 | Up 14.91 points, or 0.2% |
| Dow Jones Industrial Average | 50,926.56 | Up 20.51 points, or less than 0.1% |
| Nasdaq Composite | 26,871.60 | Up 10.53 points, or less than 0.1% |
| Russell 2000 | 2,806.63 | Up 0.3% |
AP described trading as relatively modest after U.S. bond yields rose sharply and then gave back gains. Through the October 1 close, the S&P 500 was down 1% for the week to date but up 12% for 2026. Those are figures for that date, not current October 3 performance.
Why did Micron stock go up?
Micron shares finished roughly 3% higher on October 1, according to contemporaneous market coverage, after trading lower earlier in the session. The move followed the company’s September 30 results and outlook; the one-day gain does not establish that earnings were its sole cause.
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What Micron reported
Micron Technology reported fiscal fourth-quarter 2026 revenue of $54.229 billion, compared with $11.315 billion in fiscal Q4 2025. For fiscal 2026, revenue was $133.188 billion, versus $37.378 billion in fiscal 2025. These figures are company-reported results in its September 30 release.
The company reported fiscal Q4 GAAP net income of $37.701 billion and diluted GAAP earnings per share of $32.87. Micron attributed its results and outlook to AI-driven demand and operational execution, saying these positioned it for a record fiscal 2027. That explanation is the company’s characterization, not an independently established cause.
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Micron chairman and CEO Sanjay Mehrotra said in the results release: “Micron delivered record fiscal 2026 results, and we expect an even stronger fiscal 2027.”
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Mattel shares jumped on October 1 amid market coverage tying the move to a Wall Street Journal report that Authentic Brands Group had approached Mattel about possible takeover interest at more than $20 a share. The reported approach and price are attributed reporting, not confirmed company guidance.
What Mattel confirmed
In a September 30 announcement, Mattel said Roger Lynch, a current board member and independent lead director, would become chairman effective October 2 and CEO effective on or before November 2. Ynon Kreiz was to step down from both positions effective October 2.
Was there a confirmed offer?
No offer, signed transaction, price, or deal terms were confirmed in Mattel’s announcement. The exact status and terms of the reported approach remain unresolved based on the company materials cited here. Treat the takeover story as reported interest, not a completed or agreed deal.
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Sources and dates
- The Associated Press, October 1, 2026, for index closes and market context.
- Yahoo Finance, contemporaneous October 1 coverage, for Micron’s approximate session gain and market reporting.
- Micron Technology, September 30, 2026, for financial results, outlook, and Mehrotra’s statement.
- Mattel, September 30, 2026, for the leadership succession announcement.
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